Handling camera raw images on old versions of OS X

This content is 12 years old. I don't routinely update old blog posts as they are only intended to represent a view at a particular point in time. Please be warned that the information here may be out of date.

I use Adobe Lightroom for most of my digital photography workflow but as our family takes more and more pictures on a variety of cameras, other family members need to process images – and I’m not letting them near my Lightroom catalogue!

As we tend to use iPhoto every year to product yearbooks, calendars, etc., the solution we decided on was for me to copy unprocessed images over onto an old Mac Mini, which is running OS X 10.6 (Snow Leopard) with iPhoto (still version 6, part of the iLife suite shipped with OS X 10.4, which was what originally installed on the Mini).

Old software doesn’t support raw formats

All seemed good until I we tried to import the the first batch of photos that I’d sent over. iPhoto was happy with JPGs but didn’t like the raw images (.NEF from my Nikon D700 and .NRW from my Nikon P7100). Apple’s advice on supported digital camera RAW formats for OS X 10.6 suggested that the D700 should be OK (presumably not with old versions of iPhoto – one forum post suggested I’d need at least iPhoto ’08) but that I needed to install the Digital Camera RAW Compatibility Update 3.9 for the P7100, which would also need me to upgrade to iPhoto 11 (v9.3.2). The iPhoto upgrade was no big deal (£10.49 in the Mac App Store)  but it will only run on OS X 10.7.4 or later.  Lion is no longer in the Mac App Store but OS X 10.8 (Mountain Lion) is (and it’s only £13.49). Unfortunately, Lion and Mountain Lion will not run on Core Solo or Core Duo Macs (like my Mini).

I refuse to buy a new Mac for this – the whole point of the exercise was to provide a fit-for-purpose solution using the kit we already have – and a new machine doesn’t come into that (heck, I might as well just put Photoshop Elements on my wife’s Windows laptop), so it was back to the drawing board.

If my combination of OS X and iPhoto won’t read my raw files, I’ll just need to batch convert them to something else first…

Compiling and installing dcraw on OS X

Dave Coffin’s dcraw is a Linux utility for raw file conversion and I decided to use that on the Mac Mini but it needs a bit of work to get it installed. I found a blog post that describes the process to get the latest version of dcraw working on OS X 10.7 (Lion) but the process is slightly different for earlier versions of OS X.

First up, I installed Apple’s developer tools – XCode.  These are found on the operating system DVD for OS X 10.6 (in the Optional Installs folder) but are a free load from the Mac App Store for 10.7 and later. I did register for a developer account and started downloading version 3.2.6 but then realised that it was a 4.1GB download and retrieving the DVD from the loft was easier. After installing XCode from the DVD, I updated to 3.2.6 using the OS X Software Update utility although other versions of OS X might have a slightly different XCode upgrade process.

The Unix Command Line tools are an install option on XCode 3.2.6 (they can be downloaded from inside XCode from version 4 onwards) but, once these were installed, the next step was to download and install MacPorts.  Again, there are different versions according to the release of OS X in use but I downloaded the .DMG for OS X 10.6 and then kicked off a Terminal session.

Once in Terminal, I entered the following commands:

su admin
sudo port install dcraw

following which MacPorts did all of the work to download and install dcraw and all of its dependencies.

Batch converting raw images on the Mac

With dcraw installed, there are many options for processing images but the basic syntax may be found by opening Terminal and typing:


Camera Hacker has some examples of dcraw use but I used the following commands to bulk convert batches of .NEF and .NRW files to .TIFF format:

dcraw -a -w -v -T *.NEF
dcraw -a -w -v -T *.NRW

One final tweak before import the files to iPhoto was to set the file dates to match the camera timestamp (without this, iPhoto seemed to think that the images were taken on the day they were imported):

dcraw -z *.tiff

The resulting files were ready to import to iPhoto for family use, with no risk to the master copies that are stored on my MacBook.

New cameras, raw image support and Adobe software

This content is 13 years old. I don't routinely update old blog posts as they are only intended to represent a view at a particular point in time. Please be warned that the information here may be out of date.

In yesterday’s post about my Nikon Coolpix P7100, I mentioned that I’d had to invest in new software when I bought a new camera (as if a new camera wasn’t a big enough expense). As I’m reading about Adobe’s beta of Lightroom 4, I thought it was probably worth eleborating on this, as once of my friends also had a similar experience last year – and it’s something that pretty much all Adobe users will come across if they buy new cameras and shoot raw images.

Whilst some might argue that there is no noticable difference between a fine JPEG image and something generated from a raw file, the simple fact is that multiple edits on compressed files will lead to a gradual degradation in quality. I prefer to capture in the highest possible quality, work on that, and only save to .JPG at the end of my workflow (typically before uploading to the web, or sending to a lab for printing).

So, when I bought the P7100, I found that I needed the latest version of Adobe Camera Raw to read the .NRW (raw) images that it created. That wouldn’t have been a problem, except that Adobe Camera Raw 6.x doesn’t work with the software I was using at the time – Adobe Lightroom 2.x and Photoshop CS4. So I purchased Lightroom 3, although I have to make do without editing my P7100’s images in Photoshop – it’s just too expensive to upgrade at the drop of a hat.

It’s not just me – a friend who bought a Canon EOS 600D last year suddenly found that she needed to upgrade from Photoshop Elements 8 to Elements 9 in order to work with her raw images (she could also use Apple iPhoto… but it’s seriously limited for anything more than the most basic of edits).

With the coming of Lightroom 4/Photoshop CS 6, I guess we’ll see Adobe Camera Raw 7 and, if past history is any judge of what’s coming, I’ll expect that will not work with Lightroom 3 or CS 5. In effect Adobe is forcing us to upgrade their software, in order to use the raw capabilities of a new camera.

Obviously, Adobe would like us to all use its digital negative (.DNG) format for raw images (indeed, Adobe offers a free DNG converter) but, given that neither Canon nor Nikon – the two largest camera manufactirers – are showing any sign of moving away from their proprietary formats, that doesn’t help a lot.

There may be other tools to convert from the P7100’s raw images to .DNG or .TIF for working on, but I can’t help feeling Adobe’s decision to tie Camera Raw to certain releases of its software is a retrograde step, and it won’t encourage me to upgrade my software again until I am forced to (probably by a new camera purchase…).

Distributing camera raw files along with their development history from Adobe Lightroom

This content is 14 years old. I don't routinely update old blog posts as they are only intended to represent a view at a particular point in time. Please be warned that the information here may be out of date.

I’ve written previously about how Adobe’s photo management applications such as Bridge and Lightroom use Sidecar (.XMP) files to store details of raw file edits without affecting the original image (and how that doesn’t quite work for JPEG or TIFF images).  On my system though, I found that there were no .XMP files because I had been storing the history inside my Lightroom catalog (I’ve since adjusted the catalog settings to automatically write changes into XMP) but it’s easy enough to generate an extensible metadata platform (.XMP) file for an image by either, exporting the image and selecting Original as the format in the file settings (this will save the .XMP file alongside the raw image), or, by selecting Save Metadata to File from the Metadata menu.  Either way, the resulting .XMP will be available for use in other applications (e.g. Bridge) and can be distributed with the raw image file if further processing is to be carried out on another computer.

Camera raw support for my Canon Digital Ixus: enabling DNG support with CHDK

This content is 15 years old. I don't routinely update old blog posts as they are only intended to represent a view at a particular point in time. Please be warned that the information here may be out of date.

Late last year, Garry Martin alerted me to an alternative firmware for certain Canon cameras – the Canon Hackers Development Kit (CHDK) – and I’ve been running it on my Canon Digital Ixus 70 ever since.

Importantly, CHDK makes no modifications to my camera’s firmware. The appropriate version for the camera model is downloaded and placed in a folder on the SD card that the camera uses and, when the card is write protected, this firmware is loaded at startup. If CHDK is missing or the card is not write protected, then the normal camera firmware loads. In addition to the extended functionality afforded by CHDK (which is significant – Lifehacker wrote a review of CHDK last year), I have full access to the standard camera features but the main advantages I find from CHDK include camera raw support, a live histogram and better battery information (I may also take a look at using it for time lapse photography at some point).

One of the frustrations I’ve had with CHDK is that the raw format it produces is not recognised by any of the major image editing applications (for me, that means using Adobe Camera Raw to interface with Photoshop CS4 and Lightroom 2 on a Mac). I tried installing an application that should convert these files to Adobe Digital Negative (.DNG) format (DNG4PS2) but the pre-built Mac version is known to be unstable on Mac OS X 10.5 (Leopard) and I was unable to make it compile using the latest source. There seems little point in running it on another operating system when I do all of my digital media work on the Mac, so I went back to getting the camera to store raw files in .DNG format at capture.

Unfortunately, each time I tried this, I was greeted with a message which said something like Cannot load/CHDK/badpixel.bin. Thanks to a comment from James W Manning on Flickr, I was able to work my way through creating this file: downloading a program to analyse an existing raw image taken with the same camera and identify any bad bits to create the required badpixel.bin file (I did need to run this on Windows though – the command was show_bad_b.exe rawfile.crw), which I could then copy to the CHDK folder on my SD card and enable DNG support.

Now my £130 compact camera takes raw images in .DNG format (as well as some JPEGs for reference) and I can work with the raw files just as I do with the ones produced by my DSLR. Of course, the tiny sensor means that the 7 million pixels on my Ixus 70 are inferior to the six million pixels on my old D70 (and way behind my full-frame D700 – more on that in another post!) but the additional flexibility is useful – as is the knowledge that I have the actual data that was recorded by the camera sensor, rather than with any post-processing in camera (e.g. boosted saturation that’s typically used with the compressed JPEG images).

Camera raw support in Windows Vista and later

This content is 16 years old. I don't routinely update old blog posts as they are only intended to represent a view at a particular point in time. Please be warned that the information here may be out of date.

Most of my digital photography workflow takes place on a Mac, where I use Adobe Camera Raw and Bridge/Photoshop CS3 to handle camera raw images.  With my recent purchase of a netbook (which is small enough and light enough to take out with me on a shoot – and less expensive than a dedicated storage device like an Epson P-7000), it would be useful to view the images in Windows but the Microsoft Raw Image Thumbnailer and Viewer for Windows XP has not been updated since 2005 and is not compatible with Windows Vista or later.

I did wonder if the technology had been absorbed into Windows Explorer and it seems it has… I found a forum post that suggests using Windows Photo Gallery and then installing some codecs (this post has more information on raw support in Windows Vista) but it turns out that the camera raw codecs are also available for direct download (i.e. with no need for Windows Photo Gallery) and after installation the raw file contents are available in thumbnails, previews and applications.

Unfortunately the major manufacturers (Canon and Nikon) do not produce codecs for 64-bit Windows (i.e. for people running high-end workstations with lots of memory for editing large images…) but the 32-bit codecs are fine for my little netbook with 2.5GB of RAM and there is 64-bit support for Adobe digital negatives (.DNG).

During installation, the Canon codecs complained that the screen resolution was not high enough on the netbook (1024×576) and refused to install but that was easily overcome by connecting to an external monitor with a higher resolution (no such issue with the Nikon codecs).

Incidentally, whilst I was researching this blog post I found that Microsoft also has an interesting program called Pro Photo Tools, which includes the ability to geotag photos, edit metadata, convert between raw formats, TIFF, JPEG and HD Photo; and work with Sidecar (.XMP) files (for interoperability with Adobe products – i.e. Bridge).  It too relies on the installation of the relevant raw codecs but should fit in quite nicely for some basic metadata tagging on the netbook whilst still in the field before transferring the images to the MacBook for any final tweaks when I get home.
Nikon raw image viewed in Microsoft Pro Photo Tools

Improving the performance of Adobe Bridge CS3

This content is 16 years old. I don't routinely update old blog posts as they are only intended to represent a view at a particular point in time. Please be warned that the information here may be out of date.

The computer I use for my digital photography workflow is not exactly underpowered – it’s a 2008 Apple MacBook with a 2.2GHz Intel Core2Duo CPU, 4GB RAM and a 320GB hard disk – so I couldn’t understand why Adobe Bridge (CS3) was taking so long to do anything. Sure, I do have around 15,000 digital photos and over 9000 of them are in a single folder but I was seeing more than my fair share of spinning beachballs (the Mac equivalent of the Windows egg timer – which itself has been replaced with a halo from Windows Vista onwards).

I googled around a bit and didn’t find much at first but then I stumbled across an Adobe User to User Forums post from Ramón G Castañeda where he says that:

“The Bridge that come with CS3 now makes extensive use of the GPU on your graphics display card, That’s new.

If your graphics card is underpowered, enabling Use Software Rendering will actually help performance.”

Of course – my MacBook has an integrated graphics chipset and, whilst that’s fine for the photo editing that I do, drawing all those thumbnails in Bridge was going to bog it down a bit. So I turned on software rendering, restarted Bridge and the difference was very noticeable. Sure, CPU utilisation took a hit – but previously the two CPU cores were idle as they waited for the underpowered GPU to catch up.

Enabling software rendering in the preferences for Adobe Bridge CS3

From reading around, other configuration items that can make a difference include:

  • Make sure there is plenty of free disk space available – and that it’s not fragmented.
  • Organise images into subfolders.
  • Increase the size of the camera raw cache (1GB of disk space will hold about 200 raw images – I bumped mine up to 10GB but I’m not sure if that’s made any difference yet).
    Adjusting the cache size for Adobe Camera Raw 4.5
  • Make sure your PC/Mac has plenty of memory (2GB minimum) and a fast disk (RAID 0 is good if you have a decent workstation but is not an option for laptop users like me).

Working with raw digital camera images

This content is 16 years old. I don't routinely update old blog posts as they are only intended to represent a view at a particular point in time. Please be warned that the information here may be out of date.

Recently, I went along to one of the meetings of my local camera club, which is something I’ve been meaning to do for a while but somehow never got around to. At the meeting, one of the members (Andy Gailer) gave a really interesting presentation on working with raw images. I’ve repeated most of the highlights here, adding a few notes of my own along the way.

Technical details

Raw images are exactly that – the raw pixel data that is captured by a digital sensor. So, in order to understand the use of camera raw, it helps to understand a little bit about the technology that creates the image.

Probably the most important part of a digital camera is the sensor that converts available light into electrical signals. Two types of sensor are commonly used: charge-coupled device (CCD); and complementary metal oxide semiconductor (CMOS). CCD is a more mature technology but CMOS is gaining popularity as it can be implemented using fewer components, requires less power and provides the data more quickly.

Regardless of the technology in use, digital camera sensors consist of an array of photodiodes (or “pixels”) collecting photons (minute amounts of energy which combine to make light) and each pixel is fitted with a microlens to focus light into the sensor site. The number of photons collected in each pixel is converted into an electrical charge and this charge is converted into a voltage, amplified, and converted to a digital value to be processed into a digital image, either in camera or, if a raw image is used, using a computer. It’s important to understand that, in the same way that a bucket can only hold so much water, a pixel can only hold a certain amount of light.

Sensors also come in a variety of sizes. A “full frame” 35mm sensor is the same size as a frame of 35mm film (24x36mm) but a compact digital compact camera will have a much smaller sensor. My Canon Digital Ixus 70 has a 5.75×4.31mm sensor but my Nikon D70 DSLR has a 23.7×15.5 mm (Nikon DX) sensor. The Canon squeezes 7077888 pixels onto that tiny sensor whereas the Nikon only has 6016000 pixels, but each one of the Ixus 70’s pixels is significantly smaller than the D70’s and this will affect the image quality – that’s why not all megapixels are equal.

Bayer sensor patternThe quality of the image will also be affected by it’s contents – each pixel can only capture one of three colours as it has a red, green, or blue filter over the top, usually arranged in a pattern known as the Bayer Mask, with twice as many green filters as red or blue (the pattern is designed to mimic the way that we see colour). On top of the Bayer filter is an infrared filter, then an antialiasing filter (to reduce moiré) and each of these various filters steadily reduces the overall quality of the image.

An alternative filter (the Foveon X3) employs an arrangement that is similar to the one used to make up the coloured emulsion layers in photographic film, where the red, green, and blue pixels are placed on top of one another (different colours of light will penetrate further into the sensor), meaning that all pixels capture all colours, but this sensor type is relatively uncommon and also suffers from low light sensitivity.

Bayer sensor filteringThe resulting data from the sensor consists of three channels of photographic data – red, green and blue but, with the exception of the Foveon sensor, each channel is incomplete because the mask means that only certain pixels will be activated for a given colour. During raw conversion (either in-camera, or on the computer), a process known as demosaicing is used in an attempt to fill in the missing pixel data, based on the comparative brightness of the surrounding pixels, and then sharpening is applied to counteract the effect of so many filters on the sensor.

I mentioned earlier that each sensor site (or pixel) can only capture a finite amount of light, expressed as a number of levels.

The number of bits used in the analogue to digital conversion process will determine the light sensitivity, with 8 bits representing 255 levels, 12 bits for 4095 levels, 14 bits for 16383 levels and 16 bits for 65535 levels. It’s important to understand that a sensor records light in a linear fashion, so reducing the amount of light falling on the sensor by one stop (EV) will halve the number of levels of light that can be recorded. Equally, if the light is doubled, eventually the pixel will be full and the resulting effect is blown highlights.

Similarly, as the light levels drop, an effect known as posterisation (or colour banding) becomes visible, particularly in areas such as shadow detail, or the sky.

Even a few stops can make a huge difference to the number of light levels that the sensor can determine and so it is generally recommended to expose as far to the right of the histogram as possible without clipping (I’ll describe the histogram in a follow-up post). Because human vision is not linear, during raw conversion a tonal curve (including a gamma correction) is applied to the image to make it more pleasing on the eye.

The table below shows the difference between an image recorded as an 8-bit (gamma encoded) JPEG and others recorded as a 12-bit or 14-bit (linear encoded) raw file:

Stop 8-bit JPEG (gamma-encoded) 12-bit raw (linear) 14-bit raw (linear)
1st stop (brightest tones) 69 levels 2048 levels 8192 levels
2nd stop (bright tones) 50 levels 1024 levels 4096 levels
3rd stop (mid-tones) 37 levels 512 levels 2048 levels
4th stop (dark tones) 27 levels 256 levels 1024 levels
5th stop (darkest tones) 20 levels 128 levels 512 levels

Even though the logarithmic scale used for the gamma-encoded image does not fall off as sharply as the linear scale for the raw image, the overall number of discernible light levels is reduced in the JPEG (partly due to the 8-bit nature of the file format), whereas the raw files retain more detail, allowing for some exposure compensation to be applied post-capture. In addition, due to the lossy compression that is inherent with a JPEG, further image quality is sacrificed each time the image is saved.

Colour spacesColour spaces are another consideration, with each space defining the number of visible colours (or gamut) that may be represented in an image. Which colour space is “best” is often a personal consideration but it’s important to note that we can neither see, nor print all of the available colours; however, by storing the maximum possible amount of information, there is more scope for making changes later without degrading image quality. For print work, Adobe RGB may be a good colour space but for on-screen work (where the display device has a smaller gamut), sRGB may be more appropriate. I have now switched the default setting in my Nikon D70 to Adobe RGB 1998 but in reality it makes very little difference as the colour space can be altered later.

JPEG or raw?

For a JPEG image, the following process is applied to every image by the camera:

  1. RGB information from sensor is converted to colour data.
  2. Tone curve applied to convert linear-encoded data to gamma encoding.
  3. White balance set.
  4. Contrast adjusted.
  5. Colour saturation increased.
  6. Sharpening applied.
  7. 12/14-bit native file compressed to lossy 8-bit JPEG.
  8. Image is recorded to memory card.

By shooting raw, no data is lost from the sensor and a better tonal quality is retained. Images can be reprocessed years later for better (or alternative) results; however some raw processing software will be required.

Adobe Camera Raw is a free download and allows all of the adjustments that a camera would normally make to be applied to an image (and more), under the control of the photographer. It integrates with other Adobe applications (e.g. Bridge and Photoshop) for image organisation and editing. At first, the interface can be daunting – but the controls are organised in order of significance (left to right and top to bottom) and many may be ignored. Adobe’s white paper on understanding Adobe Photoshop Camera Raw 4 is also worth a read.

Adobe Camera Raw 4.0

There is one significant drawback with raw image capture though – even though the sensor data is captured in the same way, most camera manufacturers (particularly Canon and Nikon) record the data using a proprietary format. This is why software such as Adobe Camera Raw is constantly updated for new cameras; however it’s also a risk that one day those raw images will become obsolete. There is a potential solution, using Adobe’s Digital Negative (.DNG) format but adoption by manufacturers has been slow and, for many photographers, conversion from a proprietary raw format to DNG is an extra step in the workflow.

Working with raw images

Andy gave some good advice for working with raw images and I’ve added a few tips of my own to Andy’s advice:

  • At the capture stage:
    • Just because you can edit later, don’t rely on it – take your best shots with proper settings – particularly focus and exposure.
    • Get the brightest possible shot without clipping – use the camera’s histogram function and expose to the right.
    • Check the shot in-camera by zooming in on parts of the image on the LCD.
  • Back on the computer, organise the files:
    • Download images to the PC.
    • Sort, organise, tag, rank and caption as desired.
    • Add metadata.
    • Back up the images to a separate storage location.
    • Automate repetitive tasks (e.g. renaming and captioning).
  • Process the raw images:
    • Process for maximum quality.
    • Adjust colour balance.
    • Crop, straighten and sharpen (if required – and only if no more editing is to be performed).
    • Save converted files at 16-bit and back up to offline storage.
  • Edit (if required):
    • Apply any image enhancements, clean up flaws, etc.
    • Perform any creative enhancements.
    • Apply batch actions
    • Prepare for output (printing or web) – if sharpening is required, this should be the last action on the image before saving.
  • Archive:
    • Establish and implement an archival plan.
    • Save files on external devices and media for easy access and retrieval – consider off site storage.

Further reading

Further information may be found in the following articles:


Based on a presentation by Andy Gailer. The Bayer filter images used in this post are licensed under the GNU free documentation license and the colour space diagram is ©Jeff Schewe, used with permission (images from Wikipedia).

Setting up a digital photography workflow: preferences for Adobe Bridge, Camera Raw and Photoshop CS3

This content is 16 years old. I don't routinely update old blog posts as they are only intended to represent a view at a particular point in time. Please be warned that the information here may be out of date.

A couple of weeks back, I wrote about Adobe Photoshop CS3 from a photographer’s perspective and in this post I’ll outline some of the application preferences for Bridge (CS3), Camera Raw (4.x) and Photoshop (CS3) that may be useful when setting up a digital photography workflow (with thanks to David Tunnicliffe, who originally provided me with the bulk of this information):

  • In general (at an operating system level):
    • Add some memory (noting that each PC or Mac will have a limit in the maximum amount of memory it can support and that 32-bit operating systems can only access approximately 3.2GB).
    • Resist the temptation to compress hard disk drives – disks are relatively inexpensive and the available storage capacity is increasing rapidly.
  • Bridge (CS3: my installation is at v2.0.0.975; some extra information here relating to features introduced at v2.1):
    • General: adjust the background colour – dark grey will generally provide a non-distractive background; if Bridge is to be used for importing images when a camera is connected, select the appropriate checkbox under Behavior; remove items from the Favorites list that will not be used (e.g. Start Meeting).
    • Thumbnails: enable Adobe Camera Raw for JPEG and TIFF file handling; 400MB is the default maximum file size for the creation of thumbnails and should be more than enough for most photographers (unless they scan images at very high resolutions); high quality thumbnails can be useful; however conversion on preview is an intensive operation and should be avoided.
    • Playback: few photographers will be interested in media playback options (new in v2.1 – not present in v2.0).
    • Metadata: select/deselect as required – few photographers will need audio, video, or DICOM; GPS is becoming more relevant with the advent of location-based services.
    • Labels: edit the description to match the colour coding system in use – together with ratings, these can be useful for sorting.
    • Keywords: Can be used to build a hierarchy of keywords (new in v2.1 – not present in v2.0).
    • File type associations: edit if required to change the application that is associated with a given file type. Generally, these may be left at their defaults/
    • Cache: Clear the cache if problems are experienced with thumbnails (new in v2.1 – not present in v2.0).
    • Inspector: not really relevant unless using Adobe VersionCue to manage workflow.
    • Startup Scripts: these can be disabled if not used but I have left them at the default settings (removing scripts will accelerate application load times).
    • Advanced: this is the place to clear the cache if there are issues with thumbnail display; international settings for language and keyboard are also set here; software rendering should be avoided if there is suitable graphics hardware available to do the work instead.
    • Adobe Stock Photos: probably of limited use to people who would like to sell their work! In fact, the service was discontinued in April 2008 and can be uninstalled from Bridge.
    • Meetings: Only relevant with Adobe Acrobat Connect.
  • Camera Raw (my installation has been updated to v4.5.0.175; the version originally shipped with my copy of Photoshop CS3 was v4.0):
    • Preferences (available in other Photoshop applications whilst loaded): save image settings in sidecar (.XMP) files; apply sharpening to preview images only; Camera Raw cache defaults to 1GB and can be purged if issues are experienced; JPEG and TIFF handling selected (not available in v4.0).
    • Main interface: ensure Preview is selected.
    • Workflow options (link at the bottom of the ACR window): Adobe RGB (1998) is probably the best colour space for most photographers (Sean T. McHugh explains more about the comparison between sRGB and Adobe RGB 1998); use 16-bits per channel; use size and resolution to upscale (for better results than applying interpolation in Photoshop).
  • Photoshop (CS3: v10.0):
    • General: Color picker should be set to Adobe; Image interpolation should be selected according to purpose but bicubic smoother is probably the most useful for photographers.
    • Interface: Select remember palette locations.
    • File handling: select the prefer Adobe Camera Raw for filetype options if you want to open JPEG or RAW files in Adobe Camera Raw (recommended); increase the length of the recent file list if required; disable version cue if not required.
    • Performance: Photoshop is memory hungry but don’t let it take more than 70% of the available RAM (that is the default) – use the ideal range as a guide; adjust scratch disk settings if you have multiple disks available; enable 3D acceleration if supported by the GPU; increase the number of history states if possible.
    • Transparency and Gamut: ensure opacity is set to 100% (default setting).
    • Units and rulers: minimum print resolution for new documents should be 300ppi (72ppi is fine for screen).
    • Plug-ins: this is only relevant if you have plug-ins for an old version of Photoshop or in a strange location.
    • Cursors; Guides, Grid, Slices and Count; Type: Nothing to change.

Of course, this is just scraping the surface – these applications alone are probably not the complete workflow and each of them offers far more functionality than most photographers will require. If you’re using the CS3 applications for graphic design work, then you’ll probably have a totally different setup.

When “non-destructive” edits start making changes to the original files…

This content is 16 years old. I don't routinely update old blog posts as they are only intended to represent a view at a particular point in time. Please be warned that the information here may be out of date.

A few days back, I was extolling the virtues of the Sidecar (.XMP) file format that Adobe uses for storing updated metadata and edits to digital images in Adobe Camera Raw (ACR):

“It turns out that Bridge (together with ACR) is exactly what I needed to organise my images, open them in ACR (and optionally Photoshop) to perform non-destructive edits, with the changes (and associated metadata) stored in Sidecar (.XMP) files alongside the original image (avoiding the need to maintain multiple copies of images.”

Well, soon afterwards I found out that, for raw image files, ACR does indeed create XMP files (which are also used by Adobe Photoshop Lightroom and are visible in Bridge) but, if ACR is used for JPEGs (or TIFFs), then the original files are modified.

In a blog post from February 2007, Adobe’s John Nack explains why non-destructive edits to JPEGs may be considered an oxymoron – basically Adobe appends the metadata that would normally be stored in the .XMP file to the JPEG. That means that, if I view an edited file using an Adobe product, it can see the changes but other viewers are unaware of the additional data and ignore it.

The accompanying images show a JPEG file that I opened in ACR (via Bridge) to adjust the exposure and to straighten the image. Bridge shows the updated file as being 2848×1894 pixels in size and the image edits are visible in the preview:

JPEG file edited with Adobe Camera Raw 4.0 and viewed in Bridge CS3

Meanwhile, the Mac OS X Finder (or any other image viewer) sees the original 3008×2000 pixel image, still underexposed and leaning to one side:

JPEG file edited with Adobe Camera Raw 4.0 and viewed in the Mac OS X Finder

If, like me, you like your digital asset management software to maintain the original images untouched and only perform non-destructive edits, then this may come as a bit of a shock.

Adobe Photoshop CS3 from a photographer’s perspective

This content is 16 years old. I don't routinely update old blog posts as they are only intended to represent a view at a particular point in time. Please be warned that the information here may be out of date.

Photography has been one of my hobbies for almost 30 years now and for the last four years I’ve been exclusively shooting in digital format but I’m still struggling to work out a decent workflow. Adobe Photoshop CS3 box shotSo, last Friday I took the day off work to attend a short course introducing key features of Adobe Photoshop and Lightroom (provided by my local Adult Education service and presented by David Tunnicliffe) and, at £36 for 6 hours of tuition, it was a bargain. I learnt a lot – and some people might find what follows to be a little obvious – but I’m hopething that for others it might be as useful as it was for me.

Adobe Photoshop CS3 is just one product from the Adobe Creative Suite, providing many more features than most photographers will need as it is designed for the graphics art industry in general. Even so, Photoshop CS3 includes some additional components that may be very useful for a photographer:

  • Introduced with CS2, Adobe Bridge literally bridges the gap between a file browser and the various applications in the Creative Suite, providing digital asset management functionality for organising, previewing and editing images.
  • Frequently updated for new proprietary raw formats, Adobe Camera Raw (ACR) provides the tools to open and edit raw image data from a digital camera. In addition to this, it can also work with JPEG and TIFF files to provide basic editing functionality without Photoshop.

In addition to the CS3 components above, there are two more products that may be of interest:

  • DNG is Adobe’s non-proprietary and royalty-free Digital Negative format which is intended to provide a solution for archival of digital images and has now been embraced by many camera manufacturers – the notable exceptions being Canon and Nikon. I don’t fancy my chances of being able to open .NEF images from my Nikon D70 in 30 years time but I’ll stand a better chance if I convert them to .DNG and Adobe provides a free DNG converter for Windows and Macintosh users.
  • Adobe Photoshop Lightroom 2 125x125Adobe Photoshop Lightroom is a product designed by photographers, for photographers using separate library, develop, slideshow, print and web views and including the ability to import (including creating folders), catalogue (with keywords) and backup in one action.

For me, Bridge was a revelation – I use my Mac for photography (so Windows utilities were no good to me) but I’ve always found Apple iPhoto a little too simplistic. It turns out that Bridge (together with ACR) is exactly what I needed to organise my images, open them in ACR (and optionally Photoshop) to perform non-destructive edits, with the changes (and associated metadata) stored in Sidecar (.XMP) files alongside the original image (avoiding the need to maintain multiple copies of images). In addition, now that I’m using Bridge I can drop a couple of utilities that I had previously relied on:

Previously, I’d struggled to get to grips with ACR (in fact, episode 40 of This Week in Photography featured a question from me asking for some guidance) but, armed with the knowledge I gained on the course and Adobe’s understanding Adobe Photoshop Camera Raw 4 white paper, I now understand that ACR is more than just a converter and it’s often all that’s required to make many adjustments to images (the exposure control in ACR let me recover an image that had been three stops underexposed) – and that it can handle JPEG and TIFF files too.

Adobe Camera Raw 4.0

As for Lightroom, David Tunnicliffe was very keen on the product (not surprising as he took part in its development) but, whilst I can see that its potentially useful for a professional photographer and that the ability to import, catalogue and backup images in one go would make a huge improvement to my workflow, I’m still not totally convinced by the interface. Maybe I’ll change my mind at version 3!

Adobe Photoshop Elements 7 125x125For those who don’t want to spend the money on Photoshop CS3 (it is very expensive if you’re not going to use it to it’s full potential) and who can manage without Bridge (which is only sold as part of Photoshop), Photoshop Elements (for Windows or Macintosh) includes enough functionality for many photographers, although some elements are hidden from the interface (find out more about the hidden elements at Richard Lynch’s site). Also, expect to see Photoshop Express become more and more useful over time. Meanwhile, ACR and the DNG converter are free downloads so they are available to Elements users too.

For me, I’m pretty sure that my new digital photography workflow will be built around Bridge and ACR and I expect to be writing some more photography-related posts as that workflow starts to come together.